rfwobbly
Member
"Really short" as compared to what ??
I regularly load these at 1.060" for my CZ without issue.
RMR 9mm MPR Jacketed Hollow Point OAL
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I regularly load these at 1.060" for my CZ without issue.
They're definitely tubby little guys. Unfortunately, in one of my guns by the time I load them short enough to not jam the lands, they're short enough that they don't feed correctly about 1-2% of the time. If I lengthen them, they feed great... but they're jamming the lands. It's a great bullet, but I wish they'd gone with a slightly longer ogive.
wannabefree
Member
They are just really short compared to any other bullet I have loaded. I am concerned about possible loading or ejecting issues with them plus it effects the max powder or pressures if not careful."Really short" as compared to what ??
I regularly load these at 1.060" for my CZ without issue.
Until I actually get out and do some testing it is purely conjecture on my part.
If it wasn't mentioned, I would reference this sticky, http://www.thehighroad.org/showthread.php?t=506678
The "plunk test". Page 1 and 2 have some great explanations of what an OAL looks like, and most important why its important.
Don't get caught up on the values you see because you think it sounds too short, but the rationale of why something is seated at its depth.
OAL supports three items, first as stated, Overall cartridge length (feeding into barrel and magazines), second, is the ogive to lands distance (plunk test, effects pressure build when fired) , third seating depth in cartridge (compressed or overpressure issue). All three are effected by OAL chosen. You need to have an understanding of each and what they represent and not just if it feeds into your barrel. Just my two cents worth.
The "plunk test". Page 1 and 2 have some great explanations of what an OAL looks like, and most important why its important.
Don't get caught up on the values you see because you think it sounds too short, but the rationale of why something is seated at its depth.
OAL supports three items, first as stated, Overall cartridge length (feeding into barrel and magazines), second, is the ogive to lands distance (plunk test, effects pressure build when fired) , third seating depth in cartridge (compressed or overpressure issue). All three are effected by OAL chosen. You need to have an understanding of each and what they represent and not just if it feeds into your barrel. Just my two cents worth.
Ghost In The Fog
Member
"Really short" as compared to what ??
I regularly load these at 1.060" for my CZ without issue.
Good evening and I want to make it clear I am not questioning you in any way. This is the internet and things get read the wrong way.
I have learned more from you, Linux Mint and Dudedog on this site (along with others) than I could have read in a lifetime of books. With that being said, with the RMR MPR 124's loaded at 1.060 wouldn't you be really close to a compressed charge? At velocities off 1,100 FPS I would guess you are at 5.4 to 5.5 grains of BE-86. I don't have my measurements handy but if I remember right you would have to be touching the powder with the bullet seated so deep wouldn't you?
You opened my eyes last year with this subject and it was another of the many lessons I learned here.
Just thought I would ask.
LiveLife
Member
Thank you for kind words.
I am so humbled but I think I may need to change my avatar picture.
Update: OK, avatar picture modified.
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rfwobbly
Member
In my opinion and application, compressed loads are more "bad form" than hard reloading rule. There are literally about 5 powders that should not be compressed and I simply don't use them. Additionally, I'm a target shooter and my 9mm loads rarely exceed 1060fps with 124gr. If I want to go faster, I have lots of 38Super and 357Mag loads.
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