Lee Loader

Looking to see what others are using for load data with RMR jacketed bullets in 380 and 9mm.

gary57210 wrote:Looking to see what others are using for load data with RMR jacketed bullets in 380 and 9mm.

Not sure what you're looking for with that question. I'd use a powder I had on hand that there was jacketed bullet data for in one of my reloading books. Start loads up to and including, well, wherever I decided to stop, not going over max charge shown. What was the question again?

I noticed a very close resemblance between 124 gr 9mm JHPs from RMR and Nosler 124 gr. JHPs so I started with Nosler data. My "JIC" ammo is loaded with RMR 124 gr. JHP over a upper/mid charge of Universal. Works quite well in all 4 of my 9mm pistols.

What I was looking for was how others determine what load to use for bullets that aren't listed like RMR JHP etc.

Basically, loads are interchangable between mnufaacturers if they are the same weight, size, type and construction. So a 124 grJHP from RMR (or 230 .451" RN, etc.) can be loadd with Horndy, Nosle, Sierra, etc. data, but "Reloading 101" says start with book min. and work up...

mikld wrote:Basically, loads are interchangable between mnufaacturers if they are the same weight, size, type and construction. So a 124 grJHP from RMR (or 230 .451" RN, etc.) can be loadd with Horndy, Nosle, Sierra, etc. data, but "Reloading 101" says start with book min. and work up...

All of the above and please note that construction includes length of the bearing surface.

Make smoke,

Mikld & Wheels.
You can also use data for the next heavier bullet (Heavier NEVER Lighter) They will most likely Not be your most accurate load but, will go bang & hit the target.

All else being equal Weight, Construction, Shape. You can also extrapolate out data using a few heavier & a few lighter bullets data, then average them out to get a start load for your bullet. I have done this many times for bullets with no available data or for
Light for caliber bullets. it works.
Your gonna do fine, Your asking questions
Take care & be safe...

If you refer to Richard Lee's 2nd edition you will note he lumps bullets together even though they may be of dissimilar types/shapes. He does make allowances for HP's and lead versus jacketed. The really important number is seating depth as this is what makes the most difference in pressure for a given bullet weight and powder charge. A few minutes with calipers or a micrometer combined with some research on the reference bullet maker's site should suffice to establish the safe seating depth for the new projectile. There are also a number of internet references on bullet lengths but they are not complete. If all else fails, ask the question here, someone may be able to help. Always start at the published starting load for the reference projectile and you will have a safe beginning. The maximum should be used as a stop point and worked up to in increments.