Accurate 36-270 questions.

Ian

Notorious member
Give me your overall cartridge length, barrel lengyh, and internal case capacity in grains of water (level to mouth) and I can give you some predictions.

Crimped in the crimp groove and 88 grains capacity puts 30 grains of 5744 at 1767 fps from a 22" barrel. Peak pressure of 23,000 psi.

35 grains is somewhere around 30,000 psi and 1975 fps and is actually going to burn all the powder at 17", so for your purposes and a plain-based bullet it appears that 5744 is a pretty good choice.
 

CWLONGSHOT

Well-Known Member
I dont know off hand the capacities, but the trim to length is 2.510 and my bbl is 24”
The NM case is nearly identical to the 338 Mag. But the 358’s shoulder is just a tad forward resulting in the 358’s shorter neck. Generally speaking the 358 beats the 338 by 100 fps in every same weight. (Jacketed)

Thanknyou again. MUCH appreciated.

Cw
 
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Ian

Notorious member
Take a fired case (or fresh one if that's what you have), seat a used orimer cup in it, fill it with tap water, card the water off flush with your finger, and pour the water into your powder pan to weigh it. With that number and your overall length I can figure the rest pretty closely. Starting at 30 grains of 5744 and working up over a chronograph might be your best bet, Quickload predicts that even 35 grains is going to be less than half of maximum pressure for the cartridge so you're plenty safe to start in the 30-35 grain range.
 

Ian

Notorious member
Just for s&g's I modeled your 22.5 grain load of Trail Boss using a 24" barrel and the velocity prediction was 1484 fps and a pressure peak around 33,000 psi. That was also showing 97.5% case fill, so the default case volume was close with the seating depth and bullet data I used. The powder coat always takes about 5-6% off the velocity prediction due to being so slippery.

What's crazy about TB is it peaks pressure at .3" of bullet travel, is all burnt by .4", and drops like a rock after that. By comparison, the 5744 is peaking around 1.7" down the barrel.
 

Ian

Notorious member
Reloder 7 has a more gentle pressure peak than IMR 4198. 5744 has a very gentle pressure rise in the 30K psi peak range, like all powders it gets steeper as the charge is increased. Reloder 7 might be perfect (and is generally less expensive than Accurate powders) but I don't know what CWLONGSHOT has in his larder. Like I wrote above, 5744 should be one of the top candidates for plain-based PC at 2K fps.
 

CWLONGSHOT

Well-Known Member
I have all in question in the locker.

RL7 is working well for me in the Legend. (I don’t think I could get enough in the case to be dangerous...

I’m on the road till end of the week here. Thanks for knowledge and conversation!


CW
 

CWLONGSHOT

Well-Known Member
I should have better kept this updated!

This bullet has taken a bear and two deer as of last year. But I didnt shoot anyof them! :oops:
The bear was shot with a 357 Maxi with this 270g bullet cast in 20:2 and shot twice in a tree at about 45-50 yards. First shot was a "miss" and only pissed the bear off but second was right on target and he was dead upon hitting the ground no bullets recovered.
Deer was my pop in my Whelen again uneventfull off the "porch" of the deer camp. Telling me I wanted to see what the bullet did didnt I. Hhahaha. No bullet recovered deer went 40-60 feet and tipped over.

A friend in Cali so loves this bullet he ordered a steel version so he could cast in zink. Its mass makes for a dandy zinker and he loves shooting them in a few 35 rifles he has.

I have been shooting them in my 350 Legend bolt on top of Herco powder subsonic! Great fun and very accurate! I had three rifles I wanted to "break in" last tear so I would take a different one each trip. The Legend "won" but I wasnt shooting this bullet. The MP IAN suggested before in 220 HP won out. But it was sub sonic. Thru penetration and buck went 50 yards fell on his nose stone dead.

CW
 
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CWLONGSHOT

Well-Known Member
Had some very good results with 3031 in the Whelen.


I want to try more velocity 1850 would get me there. I know that should be easy as long as accuracy holds.

CW
 

35 Whelen

Active Member
Had some very good results with 3031 in the Whelen.


I want to try more velocity 1850 would get me there. I know that should be easy as long as accuracy holds.

CW
CW .....49 grains of Imr 4831 with the 310 grain cast NOE Thumper was incredibly accurate for my Whelen
 

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CWLONGSHOT

Well-Known Member
Thats a good shootin load!!! What was velocity?

Love to read anything you care to share about these 310's. :)

I kinda reserved the 310's to the Norma. But largely cause how well these 270's shot in the whelen.

In the Norma I was 2025 ish and 1" @ 50 for first loading and powder.
 
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35 Whelen

Active Member
Thats a good shootin load!!! What was velocity?

Love to read anything you care to share about these 310's. :)

I kinda reserved the 310's to the Norma. But largely cause how well these 270's shot in the whelen.

In the Norma I was 2025 ish and 1" @ 50 for first loading and powder.
Sorry...I didn't have a chronograph that day. Others have estimated that load in the 1900-2000 fps range. I have the 270 mold too but haven't cast it yet. Those 310 Thumpers won't be recovered in anything all the way up to moose....heck you can reach an arms-length into the berm and still not find them. I have done a lot of reading about the heavy for caliber rounds, and the slower powders seem to give them a better start than fast powders, so I have stuck with them and getting good results. I need to free up some more time for casting and range time....work is getting in the way.