Taildrag15X said:furhntr,
You where in the Bolt Action side of the Sierra Manual.
The Gas Gun/AR Pages shows 25.7 Max for H335
Hodgdon's site shows the general loads for BOTH Gas Guns and Bolts, that's why the difference.
I was looking through the sierra reload guide and it showed max load of 27.5 of h335 for a 223 55gr bullet so I checked hodgdon's site and they show 25gr max load. Why the difference? and a big one at that.
"Pressure signs" in primers and/or fired brass are dubious readouts at best. More often than not, by the time you see them, you may already be grossly over-pressure. Chances are good your 26.9 load is a lot hotter than you think, especially given your results at 27.1 gr. Dropping the charge weight of what is clearly an over-pressure and unsafe load by only 0.2 gr is not enough. Even if the 26.9 gr load appears safe under certain conditions, a modest increase in temperature would likely be sufficient to push it into unsafe territory. Running loads like this simply isn't worth it for a relatively small gain in velocity. You'd be far better off tuning in a lower pressure load with seating depth.I know I'm a little late to the conversation, but I had the same question and my field testing last week gave me the answer loud and clear! I was using the V5 manual and 335 pushing the Sierra 55 gr. #1390.
When I got up to 26.6 Gr. the group tightened up to just under 1/2 MOA with no pressure signs. Next load was 26.9 Gr and I got a really tight .35" group,(pretty good for my RA) next was 27.1 and hold the phone! The first, and only, shot showed some pretty severe pressure sign as in blew the primer to pieces! I was quite surprised and went back and looked at the previous 2 loads brass (3 + 3) and no flattened primer or ejector shiners!! Winchester brass and primers. Manual shows 26.6 @ 3200fps but I'll chrony the 26.9 next week.
This^^^"Pressure signs" in primers and/or fired brass are dubious readouts at best. More often than not, by the time you see them, you may already be grossly over-pressure. Chances are good your 26.9 load is a lot hotter than you think, especially given your results at 27.1 gr. Dropping the charge weight of what is clearly an over-pressure and unsafe load by only 0.2 gr is not enough. Even if the 26.9 gr load appears safe under certain conditions, a modest increase in temperature would likely be sufficient to push it into unsafe territory. Running loads like this simply isn't worth it for a relatively small gain in velocity. You'd be far better off tuning in a lower pressure load with seating depth.
27.0 gr H335 with a bare 50 gr bullet WILL blow primers ! A moly 50 gr bullet with 27.0 is Ok .
have killed many a grass rat with 27.0 and a moly 50 gr bullets with no problems.
Maybe 27.5 in a cool underground tunnel works?
No kidding!27.0 gr H335 with a bare 50 gr bullet WILL blow primers ! A moly 50 gr bullet with 27.0 is Ok .
have killed many a grass rat with 27.0 and a moly 50 gr bullets with no problems.
Maybe 27.5 in a cool underground tunnel works?