300bo

[CWLONGSHOT]

1680 is fast becoming my favorite powder.
It will shoot faster then 4227,or h110,,,and still not show the pressure signs.
And it shoots small groups,wide open throttle!!

Yup. Here too.

When asked I always say h110/296 & 1680 will do everything for this caliber.

1680 starts where 296/110 starts ta wayne. 150 ish grains.

I wont & dont like idea of h110/296/lilgun for subs.

I have been really likjng accuracy I see with 8.5-9.7g of imr4198 & a long cast heavy bullet.

BTW, If ya would like ta try the excellent NOE 310-247 NLG bullet. Id be happy ta cast n send ya some. Coated/sized or as cast your call. Same for any member here.

CW

 

[popper]

I've go several targets from while back showing good accuracy with 4227, didn't record sizing. Just need to figure what I forgot.

 

[Mainiac]

Yup. Here too.

When asked I always say h110/296 & 1680 will do everything for this caliber.

1680 starts where 296/110 starts ta wayne. 150 ish grains.

I wont & dont like idea of h110/296/lilgun for subs.

I have been really likjng accuracy I see with 8.5-9.7g of imr4198 & a long cast heavy bullet.

BTW, If ya would like ta try the excellent NOE 310-247 NLG bullet. Id be happy ta cast n send ya some. Coated/sized or as cast your call. Same for any member here.

CW

Thanks for the offer,i may take ya up on it,sometime.
What i really want,is a 125-130 Spitzer, bullet in the top half of the neck,and 2.2 oal..

 

[Mainiac]

This week i hope to try vv133,,and 4198.
I bet these will get to 1900fps.
I can get 22grs of h335 in the bo,,dump slow,with 12 inch drop tube.about 1800fps,,and shoot in 1 hole in the paper.the lee 155 sure does shoot splendid!!

 

[fiver]

i had Josh over to ACE cut me a 140gr. spitzer shape for the 300.

but with Jacketed 180 and 200'-ish bullets i had good luck with functioning using 4227 in the AR platform at sub speeds.
i know 1680 is the universal darling in that role, but it was a here's some stuff can you make my rifle work scenario.

 

[Mainiac]

i had Josh over to ACE cut me a 140gr. spitzer shape for the 300.

but with Jacketed 180 and 200'-ish bullets i had good luck with functioning using 4227 in the AR platform at sub speeds.
i know 1680 is the universal darling in that role, but it was a here's some stuff can you make my rifle work scenario.

Is that something he keeps the drawing of,and can run again?

 

[sundog]

RCBS 7.62mm-130-SPL. GC'd and PC'd, mine weigh 140.

 

[popper]

Well, scope on the CVA is fine. Alloy is the problem! Alloy cast in past has nice small holes and acceptable group, new stuff is larger in dia. Cycled 50 rnds through the henry 308W, found some that wouldn't. Shot some, did fine. Got a metal detector to find the sprinkler valves in the back yard so I can get the system fixed. Then put down some grass seed before the rain comes in. She's down at the ranch for 'gal's' weekend. Somebody got a rabbit to let loose, it wants to stay in the house. Duh.

 

[fiver]

i doubt the running it again part, but he may? have the drawings.
i'll give a short description,, it's similar to the Ed Harris [LEE] bullet only shorter,, body first then a titch in the nose.

 

[Mainiac]

Is that something he keeps the drawing of,and can run again?

i doubt the running it again part, but he may? have the drawings.
i'll give a short description,, it's similar to the Ed Harris [LEE] bullet only shorter,, body first then a titch in the nose.

Sounds like what im looking for.
Went looking for the rcbs 130sp....cant beleave they want 150-160 bucks,for rcbs molds now,,WOW

 

[popper]

Cleaned the CVA today, not bad just a few speckles. 310 size doesn't leave lead ring from in front of case mouth but case neck still is dirty. Must have grabbed the wrong ingots for the pot, really soft and peak psi shouldn't be above 30k psi (pistolish psi)with the 4227 load. I use an Accurate 142C and D - PB and GCd. Pushed the PB to 2150 in 1:10 carbine with the right alloy. I have 1680 but haven't found a good load with it yet. CVA gets cast as I put IR on the carbine for night yote and hog hunting at the ranch using Vmax and FTX. Got a few SSTs but can't find them anymore.

 

[fiver]

you can get Tom or Jared to cut you what you want for @ hundred shipped TYD easy nuff.

 

[Mainiac]

Having alot of fun with this rifle.i realize it isnt a benchgun,but it shoots like one...except...
I get alot of first shot fliers.has to do with manually letting bolt go.dont know how to overcome this,yet.
Ive seen 1911,s act the same way.

For now,i guess if i wanted tiny group,id pump the first shot into the berm.

 

[Mainiac]

This lee 155 bullet,,is a shooter!
Reliably shoot under an inch with...
H335. 1600fps
V133. 1800fps
4227. 1900fps
1680. 2100fps

Have never had a misfeed,nor a jam!!!

 

[popper]

OK, I'm out of ideas. CVA 16" 1:8 single shot. 145gr PB, BLL, (3 coats applied with Qtip). Tried several alloys. 15gr 4227. shooting 50 yds, bullet holes are nice and round, the ones that actual hit the target. Sized these 310, had already tried 308. Target is several 8x11" paper. Scope (4-12 vortex) is good. 3 vmax touching, same session. Scrubbed the barrel this morning Patches, chore boy, swab), no real leading, no 'sparkles'. Did use a dryer sheet with regular patch. Wow, cleaned a lot of black gunk out. 32k psi, 1750 fps (from GRT). I checked for square base to 'bore'. I've pushed same bullet to 2150 fps, coated. Left lower is previous from long time ago -hotter load and PC vs BLL this time.

 

[Rick H]

OK, I'm out of ideas. CVA

I haven't been following this thread as I don't have a Blackout. I do have a CVA Scout2 in 44 mag. I'm not sure if this applies but my 44 gave me fits until I figured out that the factory scope mount screws were too long. They just barely seated the mount so it was finger tight and one couldn't feel movement of the one piece mount. However, my rifle was constantly shooting into two or more "groups". I would get two or three shots clustered tight, then another 2 or three clustered tight but some distance from the original ones. I had a devil of a time figuring out what was wrong. Ground off a thread or so from the one piece ring mounting screws and it shot much better.

I have also been warned not to oil or grease the locking ramp/wedge because that can cause accuracy problems. I can't confirm this because I always keep them dry. My CVA certainly isn't a bench rest rifle but it went from 5"+ five shot groups at 100 yds to under 2 1/2" with cast and under 2" with jacketed full strength loads. I didn't even fuss much developing the loads, shot well enough for my purposes right off the bat.

 

[popper]

Mine does great with jacketed, decent with cast (used to). This is 1950 fps GC & PC with front bag only, from 2021. Just trying to get a plain base plinker load. GC & PB molds are same design, just PB version is a problem. GC cost $. Yes, my rail came loose so I put red loctite on the screws. Tried a Boyds thumbhole stock, didn't like it.

 

[fiver]

try more like 12grs. of that 4227.

 

[popper]

Looks like I found my problem. Base not 'square' to axis. Lined up several base down on a flat steel plate. Visible error, can see the tilt. Thought that was the problem when I got a 'circle' of holes (pattern appears to be a circle), same bullet @2150 fps. couple yrs ago but also thought it might be gas port problem. 50 yds (150 ft), 12" (.66 ft) SIN is .00044 = 0.025 deg. So basically my casting sucks. Really, the sprue cut. I assume a GC helps by making a 'false' square base, the push-thru sizing won't correct the base with hard alloy. I've got other powders for lite loads that work, just trying to get about 1800 fps vs 1200. A 0.005 deg error on base is .28 deg error. Could be an answer for un-known 'fliers'.