design and alloy
- Thread starter fiver
- Start date
fiver
Well-Known Member
measure that slug, there is a taper there.
I know the eye can't see it but I bet it's 1-1.5* or so.
the loverign designs can take some speed if they are a good fit to the throat taper.
I have been running a loverign in my 340-A past jacketed velocity's with jacketed loads.
that bullet just snuggles right up into the throat like the proverbial morse taper Ian talks about and makes it real easy.
unless I lube all of the grooves then all bets are off.
give your modified bullets a shot at about 1900 fps. they will probably surprise you.
fighting the crooked throat with mold designs will not get you any more velocity.
your destroying the bullet as soon as you pull the trigger by bouncing it off the barrel.
I know the eye can't see it but I bet it's 1-1.5* or so.
the loverign designs can take some speed if they are a good fit to the throat taper.
I have been running a loverign in my 340-A past jacketed velocity's with jacketed loads.
that bullet just snuggles right up into the throat like the proverbial morse taper Ian talks about and makes it real easy.
unless I lube all of the grooves then all bets are off.
give your modified bullets a shot at about 1900 fps. they will probably surprise you.
fighting the crooked throat with mold designs will not get you any more velocity.
your destroying the bullet as soon as you pull the trigger by bouncing it off the barrel.
bns454
Active Member
I will try both bullets.the 180H did ok to 2k,the loverin might work better.I wont get bored anyway.
Tomme boy
Well-Known Member
Ian, the 188 Hunter was never made to be driven as hard as these others. I have said on other forums and I think here it was to be a ~1MOA@22-2300fps tops.
It starts acting real funny around 2400. I know it is partially that bore rider section of the nose. And i'm not the greatest caster either. I cheated with a premium barrel. But others have had it shoot very well too. You keep it under 2000 and it really shines.
It starts acting real funny around 2400. I know it is partially that bore rider section of the nose. And i'm not the greatest caster either. I cheated with a premium barrel. But others have had it shoot very well too. You keep it under 2000 and it really shines.
M3845708Bama
Active Member
This is a typical bore rider used and discussed cast and dressed with GC and PC it weighs just over 200 gr. I size drive band portion to .310in and the bore rider to either .300 or .301 in depending on rifle used. The drive band portion is shortened to just over ccaliber diameter which extends the bore rider portion past the throat and into the riflingso seating depth is not a major issue. Now the first contact is between the throat and the taper between driveband and bore rider. It looks crazy but shoots very similar ro run of mill jacketed bullets. It you take your time on some days it meets or exceeds match jacketed. bullets. It is strickly PC with no grease groves. Shoots very nive also
fiver
Well-Known Member
I can't get that picture to blow up to read the as cast numbers.
I will have to go check it out on their web page.
but I am betting that sloped front drive band is the key to how much of this works.[in a pretty close to saami throat]
it takes a ton of stress off the nose and allows any set back to be held firmly and straight just like the 165A does.
in a big overgrown throat it's a different story and I am convinced the that shape difference is why we have different results and have to seek an alternate solution through alloy, design, and load changes.
we all speak of the 308 like it's standard [and it has been standardized since day one] but the manufacturers interpret that standardization differently like it has only a plus tolerance or like it is a guideline that say's this is the minimum diameters, anything over that is okay, go for it.
I will have to go check it out on their web page.
but I am betting that sloped front drive band is the key to how much of this works.[in a pretty close to saami throat]
it takes a ton of stress off the nose and allows any set back to be held firmly and straight just like the 165A does.
in a big overgrown throat it's a different story and I am convinced the that shape difference is why we have different results and have to seek an alternate solution through alloy, design, and load changes.
we all speak of the 308 like it's standard [and it has been standardized since day one] but the manufacturers interpret that standardization differently like it has only a plus tolerance or like it is a guideline that say's this is the minimum diameters, anything over that is okay, go for it.
Tomme boy
Well-Known Member
Run thats why I say I am not the greatest caster. I can figure out the fit. The alloy is what I am learning from you guys right now.
Because of the wrong alloy. I have mostly ran range scrap with pewter added for plinking. When I was trying to see how fast I could get different ones to go I was using 1/2 virgin Lino to 1/2 WW. I would make up 75 lb lots at a time.
I don't know when or if I ever get back to a 30 cal again. but the knowledge will help if I do. The only 30 I have know is a Mosin that shoots unbelievable at 2000fps with a 215gr design of my own. I know I can use all of these same principles for this rifle but if you have ever had one of these you know how bad the triggers are on them. I am not going to spend what they want for a trigger for these.
Because of the wrong alloy. I have mostly ran range scrap with pewter added for plinking. When I was trying to see how fast I could get different ones to go I was using 1/2 virgin Lino to 1/2 WW. I would make up 75 lb lots at a time.
I don't know when or if I ever get back to a 30 cal again. but the knowledge will help if I do. The only 30 I have know is a Mosin that shoots unbelievable at 2000fps with a 215gr design of my own. I know I can use all of these same principles for this rifle but if you have ever had one of these you know how bad the triggers are on them. I am not going to spend what they want for a trigger for these.
Rally Hess
Well-Known Member
I did most of the work with the 188 with it just engraving. I used the 188's I had cast to reuse the alloy and cast the 311-195's. I tried soft to hard alloys and slow to 2300. Only thing I didn't try was seating deeper to allow it to jump some at launch. Your description of the 190x got me to thinking I should try, because I really believe that is what is happening with the 188 in my rifle. I am seating the 311-195 much deeper, because it won't feed the last round out of the magazine seated to just engrave. So i started seating it deeper to get correct feeding, and the groups tightened up. Kind of a backwards process I know, but it worked! I really wanted the weight of the 195 anyway and like the design for a hunting round, but still don't want to admit defeat with the 188. SOOOO, I'm going to cast a few out of the same alloy and seat them deeper, just because I can. LOL