255 grain rnfp mastercast load data?

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255 grain rnfp mastercast load data?

Post by orpheoet on Fri Nov 21, 2014 8:38 am

I picked up 500 of these to use for pinshooting but I cant find much info on loads. I read  a post from about 10 years ago about something from midway  that recomended a starting load of 3.1 gr of bullseye. I loaded a few with 3.1 grains and an oal of 1.23. Thats the longest oal i could get to go through the magazine. Im a bit concerned because the bullet seats deeper than 230 gr round nose. Anybody have experience with these? They are .452 and I have read of people using them for bowling pins. I've been using 230 gr lead with 3.6 grains of bullseye. Thats the range I want these to be in. Slow but heavy:)

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Re: 255 grain rnfp mastercast load data?

Post by AllAces on Fri Nov 21, 2014 11:23 am

These bullets might be intended for use in revolvers, such as the Ruger Blackhawk chambered in .45 Colt, rather than for a 1911.

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Re: 255 grain rnfp mastercast load data?

Post by dronning on Fri Nov 21, 2014 11:32 am

I don't have any Bullseye data but back way off your 230 loads as a starting point. Heavier bullet = higher pressure, deeper seating also = higher pressure.

Back when I shot pins I loaded a friends 260gr cast bullet for my 1911 with Red Dot but it was long ago and I don't have/remember the data anymore, he had already done all the work to get them to run right I just started a little lighter and worked up to where he was. You don't need to run them any faster than 650-700fps they will slam the pins and recoil nice too!

- Dave

ps I think we went with a stiffer recoil spring too even at the lower speeds.


Last edited by dronning on Fri Nov 21, 2014 11:36 am; edited 1 time in total (Reason for editing : added info)

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Re: 255 grain rnfp mastercast load data?

Post by orpheoet on Tue Nov 25, 2014 11:32 pm

Well, 3.1 grains of Bullseye with oal 1.185 functioned perfectly with 12 lb spring. Very light recoil. How well it does with pins, I'll let you know. Next pinshot is in a month.

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Re: 255 grain rnfp mastercast load data?

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