30 sherman magnum

elkaholic

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hauser, id.
A little more Max load testing today:
28" Bartlein 9 twist
230 Berger. F215. ADG brass

RL33
91 grs. 3111'
92 grs. 3160*. slight x mark and bolt lift

215 Berger
92 grs. 3246'
93 grs. 3289'

N570
88 grs. 3259

*The only round that had pressure signs was the the 230 @ 3160'
All primer pockets still tight after 3 firings at these velocities.
I'm not suggesting that anyone should run these loads, but I think you get the idea of the cartridge and brass capability with N570 and RL33.
IMG_20200222_160659870.jpg
IMG_20200222_155634318.jpg
 

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elkaholic

Official LRH Sponsor
Joined
Dec 4, 2008
Messages
9,389
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hauser, id.
More pressure/velocity tests:
30 SM 28" Bart 9 twist
215 Hy
F215
RL26
79 grs. 3117
80 grs. 3132 Bolt click
81 grs. 3221 Heavy Bolt
*79-79.5 max in this rifle

N565
82 grs. 3099. pressure good
no more loaded but 83 likely max
around 3140?
IMG_20200223_142602166.jpg
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westcoasthunter

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Aug 31, 2013
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261
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lebanon oregon
elkaholic, so with your N-570 and 230 bergers. i think i seen you had 86grs of powder and got 3080FPS. my question is that with once fired brass? or did it take a couple shots to get up to that?
 

elkaholic

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hauser, id.
Just got some 245's in so loaded up some RL 33 and ran them over the magneto speed. It looks like 3039 is about what I would consider max in my rifle. Just very slight bolt lift was the only sign of pressure starting.
Web was good, no xmark, no flattened primer, case sized back to spec and primer re seated TIGHT! This was the 7th firing on the brass.
IMG_20200306_135502658.jpg
 

codyadams

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Jan 7, 2015
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2,881
Location
Southwest Wyoming
Any issues with a carbon ring or fouling from rl33? I have thought about trying it in my nm but don't know if I should. So rl33 is getting better velocity than n570?
 

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