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Discussion Starter · #1 ·
For those who are interested in velocities and the effect of barrel length differences, here is some as it relates to the use of Hodgdon's H322. The rifles used were the Marlin 1895 Guide Gun (18.5" barrel) and the Ruger #1 (22" barrel). Two bullets were compared, a jacketed and a cast of similar weight.


Code:
Starline Cases	Fed 210	Marlin 1895	Ruger #1	
				 		H322		18.5”		22”		Difference
RCBS 400 GC Cast	45 gr		1661		1728		67
Rem 405 SP			45 gr		1511		1570		59
RCBS 400 GC Cast	47 gr		1783		1813		30
Rem 405 SP			47 gr		1519		1668	
RCBS 400 GC Cast	49 gr		1825		1890		65
Rem 405 SP			49 gr		1678		1777		99
RCBS 400 GC Cast	51 gr		1903		1969		66
Rem 405 SP			51 gr		1813		1908	
											64 fps Avg Diff
A couple of notes; all velocities are three shot averages. There are two exceptions which most probably were single shot records as the velocities were the same for all three both in the 1895 column. They were 1519 and 1813. I left both out of the velocity difference averages. The chronograph was an old Competition Electronics model.
 

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looks like a fun comparison. I'd like to see 26in. and 32 in. as well. :) Looking at H4198 could be another variable.
 

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I have proposed, based on my observations, that the average difference in maximum Marlin 1895 45-70 loads per inch of barrel is 20 fps. That would be 70 fps between the 18.5" and 22" 1895s. The average of the data cited is 64 and one-third fps. If you throw out the outliers the average becomes 64.25 fps. I believe if the loads were shot in a 22" 1895 the average might have been even closer to 70 fps due to the difference in the throats between the Marlin 1895 and Ruger #1. In addition, if the loads were closer to the maximum for the Marlin 1895 the result may have been somewhat different. So, I'm sticking to 20 fps per inch of barrel as my rule of thumb.
 

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Thats my story and I'm stickin to it!!!! :lol: :lol:

O.K.-Golsovia..Lets see! 24 inch barrel on left 18.5 on right.

250 Barnes XFN-2555 fps(24 inch barrel)-2383 fps(Giude Gun)=172 fps or 31.2 fps per barrel inch.
300 Barnes XFN-2137 fps...2100 fps=137 fps or 24.9 fps per barrel inch.
300 Noser PP-2488 fps....2333 fps=155 fps or 28.1 fps per barrel inch.
350 Hornady FP-2170 fps....2041 fps=129 fps or 23.4 fps per barrel inch.
350 Speer......2235 fps......2063 fps=172 fps or 31.2 fps per barrel inch.
400 Speer......1994 fps......1856 fps=138 fps or 25.0 fps per barrel inch.
400 A-Frame..2021 fps.......1928 fps=93 fps or 16.9 fps per barrel inch.
Factory Hornady 350..2198 fps..2028 fps=170 fps or 30.9 fps per barrel inch.

Now..What can be gained by this when each bullet acts differently than the next.With an "Average" difference of 25.8 fps per barrel inch all from a 450 Marlin with Max loads shot in a 24 inch test barrel then a 18.5 inch Guide Gun.

Jayco :lol: :lol:
 

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Discussion Starter · #5 ·
I was especially pleased to see that the velocities tended to stay together for a given charge weight and bullet in either gun. The cast loads, especially, were surprising as they had an average range spread of only 15.3375 fps and all shots recorded. The jacketed bullets actually were a bit higher at 22.5 fps based on the six groups of shots which recorded instead of eight in the cast. Each charge weight was thrown, not weighed, (after the measure was set, of course) using an RCBS Uniflow measure so, for anyone concerned that you can't throw accurately with a measure, this evidence (and this powder) refute that.

Another side note, these loads are not maximum published charges according to those who shoot the maximum commonly accepted pressures (40,000 cups) in their 1895s. However, 51.0 grains would appear to be a lot closer to the 55 grain maximum load which Hodgdon shows for the 400 Speer than the 4 grain difference suggests. 55.0 grains gave them 1984 fps in a 24 inch barrel using Winchester cases and CCI primers. The Ruger 22 inch barrel came in only 76 fps behind that with the Rem 405 so prudence might be wise with the given set of variables I am working with. I should also note that this lot of powder seems a bit fast. I shot a few rounds of the same cast bullet from a previous batch of H322 which had one grain more than my top loads here. (They were 52.0 grains.) They gave 1800 fps and 1850 fps averages for two shots each so were more than 100 fps behind these loads even with a bit more powder.
 
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