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Post by jims on Sept 15, 2021 20:04:18 GMT -5
I have a Ruger No. 1 in SML .45 caliber, 26 inch barrel. SMI breech plug, much shorter than a Savage breech plug. More like RBs or a NULA. The barrel is 1.2 inches in diameter for the first 5 inches.
I shot a load of 10 grains of 4759 and 60 of 4198. Speed somewhat over 2900 fps. The primers always have been a bit hard to get out but part of that is the difficulty in accessing the same. Any way used a CCI m primer. Shot to the same exact spot as last year's sight in so only shot once and was done except I noticed the primer had a fair amount of bulge. Never really noticed this before.
I do not think the load is too stout for the SML. using a 230 grain Fury with the Harvestor light blue sabot. Nothing exceptional on the used sabot.
Thoughts? I can easily enough reduce the load but have used it before without issue.
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Post by kbrezlin on Sept 15, 2021 20:27:24 GMT -5
I have shot a similar load 10/60 duplex of 4759/Rel7 and didn’t see any issues in my 10ML2 with an arrowhead plug, 225 Accumax and a harvester light blue. I did see the petals missing on the sabot but it wasn’t drilled. Usually 3 of the 4 were gone.
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ronc
Junior Member
Posts: 90
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Post by ronc on Sept 15, 2021 20:55:17 GMT -5
I have an older 45 cal and 50 cal SMI MZ barrel and bulged primers were a problem in them with what we consider some normal loads. Ron Name liked to use a bigger vent hole diameter, some around .060 which I had. I solved the problem by installing a standard Savage vent liner in the breech plug. I would suggest you check the vent hole diameter, it may have opened up a bit too much...
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Post by hillbill on Sept 16, 2021 4:15:49 GMT -5
If you have the old 209 plug sounds like your flame channel is carboned up, drill it out and you should be good BUT 10 grains of booster in hot weather MIGHT also be a contributing factor.
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Post by Richard on Sept 16, 2021 7:09:22 GMT -5
Jim's..BTW, had you happen to be shooting over a chronograph? If you had, a spike in velocity might have indicated your problem?....As compared to previous readings.
If you had been shooting at say....100 yards, an increase in pressure would not necessarily show up on bullet impact.
Bill's thoughts are probably where the problem lies.
For me?.....Shooting without my LabRadar (or chronograph) is like taking a bath without water! (one of my dad's favorite expressions)
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Post by jims on Sept 16, 2021 19:08:49 GMT -5
Pleased with all the thoughts. Richard: If one had an increase of 100 fps with the same load (other than warmer temps) what would that indicate to you?
I had cleaned the breech plug in all regards last year in all aspects when I put it away. This was the first shot on a cleaned plug and barrel but it only had about 5 shots on it before that last year before cleaning.
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Post by Richard on Sept 17, 2021 5:44:24 GMT -5
The same lot of powder? Primers? Same chronograph/distance? Bullet sizing? Accuracy of charge? All those being equal? One would expect similar results.
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Post by jims on Sept 17, 2021 6:33:03 GMT -5
Actually I switched from Fed 209a to CCIm. The breech plug etc. was totally cleaned. The weather was warmer. Old speed 2890 fps, new 3000 fps.
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Post by saskquach on Sept 17, 2021 14:10:26 GMT -5
Hello Jims,
Not all primers are created equal! Softer material in the cup? Warmer weather and placement of and type of chronograph can make a difference. Need to try that load again with the fed 209a primer. And... I am jealous of your rifle! Have owned a few Ruger no.1 rifles... my wife wont let me modify hers into a sml tho.
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