CurryCornDog
Member
- Joined
- Mar 2, 2023
- Messages
- 33
Hello everyone,
I am new here, and yes, I unfortunately have ANOTHER question on Min OAL and a tight-throated barrel. I ask this after scouring the Reloading Manual of Wisdom here on this site for weeks, as well as every thread I can get my hands on- here or elsewhere. Conflicting information has lead me to post this and garner wisdom from the THR collective.
With the standard waiver out of the way, I will float my conundrum as concisely as possible.
Some say find the OAL with plunk testing, start low in charge, and find the butter zone regardless of OAL, within reason. **HOWEVER, others say seating below MIN OAL in 9mm can cause drastic increases in PSI/CUP.**
Min OAL suggested in Lyman 51st and Lee 2nd Edition for 124 gr. JHP XTP is 1.060" with Accurate No.5 powder. The 124 Gr. RMR MPR Nuke (.355) is the bullet in question. Yes, the XTP AND RMR Nukes are apples and oranges. But by everything I can research, it has a similar-yet-not-identical profile as the Hornady XTP listed for that OAL for Accurate No.5 powder in both books. As I understand, finding most similar published data-to-bullet and working from there is the way to go. I cannot find published load data as of yet for the RMR Nuke.
The MAX OAL I have calculated for this specific bullet and my specific barrel is 1.0640". I seat to 1.0620-1.0625". Yet variations in ogive of bullet has me seating dummies as low as 1.057" to properly plunk, twist, and drop out of chamber cleanly. I am using a crimp tight enough on every round to create a 0.375" case fitment around the bullet and removing the bell from expanding. The bullet is seated properly snug by press-testing and measuring no movement from set OAL. For those shorter rounds, being under listed Min OAL has me concerned, though i understand tests in books are not done with standard barrels.
Should I set these aside for a more forgiving chamber/firearm and try another bullet? Or go ahead with minimum powder loads and give it a try to work it up?*
GEAR (if relevant):
-Press: Lyman All American 8
-Dies: Lee 4 die set (FL sizing/deprime, powder-thru-expander, bullet seat, and FCD)
-Brass: Blazer once-fired
-Powder: Accurate No.5 (Chosen beforehand for its seemingly large and forgiving load range).
-Bullet: RMR MPR Nuke 124 gr.
-Primer: ZSR (Hey man, it's all they had. They go bang.)
^If youre still reading after that, thank you. That is my question, and any comments and thoughts are welcome.
For those still reading, I am not one to take risks, and only want two piles: a pile of 130 PF for IDPA, and a hotter pile for self-defense. Yes this bullet is unnecessary/overkill/too expensive for IDPA. I chose this bullet to both satisfy my want to both compete and load perhaps a bit hotter for stockpiling defensive rounds should the unlikely-yet-possible scenario come about where everything turns to crap. I'd rather just mono-crop the projectiles to keep things simple and only have to change powder loads as necessary. That was the idea, anyway...until I saw how tight these damn things are in my chamber.
I appreciate everyone patient enough to read through, and if you do respond, thank you for taking the time. I will try to respond as soon as I can if my question is met with another, or hell, just to say thanks for your time.
For those curious, factory rounds I have tried all went bang, ranging from Federal HST 124 gr. (1.0995"-1.1000" OAL. Much more conaical shape, thus of course a different ogive) to Blazer brass 124 gr.
I am new here, and yes, I unfortunately have ANOTHER question on Min OAL and a tight-throated barrel. I ask this after scouring the Reloading Manual of Wisdom here on this site for weeks, as well as every thread I can get my hands on- here or elsewhere. Conflicting information has lead me to post this and garner wisdom from the THR collective.
With the standard waiver out of the way, I will float my conundrum as concisely as possible.
Some say find the OAL with plunk testing, start low in charge, and find the butter zone regardless of OAL, within reason. **HOWEVER, others say seating below MIN OAL in 9mm can cause drastic increases in PSI/CUP.**
Min OAL suggested in Lyman 51st and Lee 2nd Edition for 124 gr. JHP XTP is 1.060" with Accurate No.5 powder. The 124 Gr. RMR MPR Nuke (.355) is the bullet in question. Yes, the XTP AND RMR Nukes are apples and oranges. But by everything I can research, it has a similar-yet-not-identical profile as the Hornady XTP listed for that OAL for Accurate No.5 powder in both books. As I understand, finding most similar published data-to-bullet and working from there is the way to go. I cannot find published load data as of yet for the RMR Nuke.
The MAX OAL I have calculated for this specific bullet and my specific barrel is 1.0640". I seat to 1.0620-1.0625". Yet variations in ogive of bullet has me seating dummies as low as 1.057" to properly plunk, twist, and drop out of chamber cleanly. I am using a crimp tight enough on every round to create a 0.375" case fitment around the bullet and removing the bell from expanding. The bullet is seated properly snug by press-testing and measuring no movement from set OAL. For those shorter rounds, being under listed Min OAL has me concerned, though i understand tests in books are not done with standard barrels.
Should I set these aside for a more forgiving chamber/firearm and try another bullet? Or go ahead with minimum powder loads and give it a try to work it up?*
GEAR (if relevant):
-Press: Lyman All American 8
-Dies: Lee 4 die set (FL sizing/deprime, powder-thru-expander, bullet seat, and FCD)
-Brass: Blazer once-fired
-Powder: Accurate No.5 (Chosen beforehand for its seemingly large and forgiving load range).
-Bullet: RMR MPR Nuke 124 gr.
-Primer: ZSR (Hey man, it's all they had. They go bang.)
^If youre still reading after that, thank you. That is my question, and any comments and thoughts are welcome.
For those still reading, I am not one to take risks, and only want two piles: a pile of 130 PF for IDPA, and a hotter pile for self-defense. Yes this bullet is unnecessary/overkill/too expensive for IDPA. I chose this bullet to both satisfy my want to both compete and load perhaps a bit hotter for stockpiling defensive rounds should the unlikely-yet-possible scenario come about where everything turns to crap. I'd rather just mono-crop the projectiles to keep things simple and only have to change powder loads as necessary. That was the idea, anyway...until I saw how tight these damn things are in my chamber.
I appreciate everyone patient enough to read through, and if you do respond, thank you for taking the time. I will try to respond as soon as I can if my question is met with another, or hell, just to say thanks for your time.
For those curious, factory rounds I have tried all went bang, ranging from Federal HST 124 gr. (1.0995"-1.1000" OAL. Much more conaical shape, thus of course a different ogive) to Blazer brass 124 gr.