6BR 90BT Reloder 15 ! Need opinions

[762plinker]

Wow ! What the hell is that ? That looks wayyyyy past cratering .

yep on the verge of blanking

 

[762plinker]

R15 is crazy as a March hare. One of the most temp sensitive powders on the market.

yeah i know . i won a long range national championship with that stuff...but it is the reason there is 15.5..which i shoot today

 

[Old Navy]

Wow ! What the hell is that ? That looks wayyyyy past cratering .

Tell me about it! That is the worst one I got with out blowing the primer. I have a couple more I shot in a different rifle that were not quite that bad. When I bought my third Model 12 I just sent it to Carlsbad before I even shot it. Here it is after the bushing/mod. My first build was on a 700. It went almost 8K rounds before I sent it to GreTan.

 

[Old Navy]

That is not a hot load. 107 over 30 grains of Varget with CCI-450s. I posted another photo of the fired brass with the same load after the bushing/pin install. The before and after photos were shot with the same 100 round box bumped .0025" to .003". I didn't measure this one but on a couple other I did were crated at. 010".

 

[JTEX]

Wow ! What the hell is that ? That looks wayyyyy past cratering .

Yeah.....I've never seen anything like that!

 

[Okumacaptain]

R15 is crazy as a March hare. One of the most temp sensitive powders on the market.

I’ve been shooting Reloder 15 exclusively for about the last 3 years and haven’t noticed any temp sensitivity. Just sayin !

 

[urbanrifleman]

I’ve been shooting Reloder 15 exclusively for about the last 3 years and haven’t noticed any temp sensitivity. Just sayin !

I'm not really sure how that would be possible since the average velocity change between 30° and 100° is about 100 ft per second.

I chased that crazy stuff for years. That was also the reason there was so much of it available in pulldown because of the military had it all disassembled when they used it on a contract for 308 ammo and found out it was crazy temperature sensitive

 

[Laurie]

That is bad advice. Blown primers follows cratering when they get bad enough. These wouldn't go in the shell holder.

Define 'blown primers'. A blown primer usually means either the cup failed, or more commonly pressures were such that the case-head expanded enough to produce major gas leakage around the primer and the case being (and possibly bolt-face too) trashed. The pictured primer is a serious case of primer cup metal extruding and is very close to the cup 'blanking' leaving a central hole. It is a combination of high pressure and poor firing pin fit, but a combination of pressure characteristics, cup metal, and pin/bolt fit that produce an extruded round plug rather than the usual hollow crater with raised edges.

Wow ! What the hell is that ? That looks wayyyyy past cratering .

I have a Savage PTA action that would produce this precise result with a 223 Rem 90gn VLD heavy load with one particular make of primer. Pressures were such that the Lapua brass saw several firings before being retired to lighter load duties, not at all overstressed and retaining tight pockets. The condition was extremely undesirable nevertheless as the next stage was primer blanking and that considerable size cylindrical plug being blown out into the firing pin hole in the bolt-face and having to be ejected before the next shot was taken.

R15 is crazy as a March hare. One of the most temp sensitive powders on the market.

................ and the powder that produced the cylindrical extrusion/cratering was Alliant Re15. Normally, we don't worry over-much about temperature sensitivity in the British Isles, especially northern Britain where I am. With this 223/90 long-range load with Re15, I had to watch our weather very closely as the occasional summer warm spell would readily produce this primer condition and an occasional blanking episode. Keeping the ammo in an insulated sandwich box helped even if it caused much derision and jokes about infant school lunches. (Even with our cooler weather, I wince seeing 100-ct ammo boxes sitting in full sun with their lids open throughout F-Class matches with no effort made to shade the cartridges. Bear in mind too that we're on the point between 30 and 45 minutes in a GB F match as we pairs shoot, more than long enough exposure to make brass very hot to the touch even in the English sun!)

 

[Okumacaptain]

Define 'blown primers'. A blown primer usually means either the cup failed, or more commonly pressures were such that the case-head expanded enough to produce major gas leakage around the primer and the case being (and possibly bolt-face too) trashed. The pictured primer is a serious case of primer cup metal extruding and is very close to the cup 'blanking' leaving a central hole. It is a combination of high pressure and poor firing pin fit, but a combination of pressure characteristics, cup metal, and pin/bolt fit that produce an extruded round plug rather than the usual hollow crater with raised edges.




I have a Savage PTA action that would produce this precise result with a 223 Rem 90gn VLD heavy load with one particular make of primer. Pressures were such that the Lapua brass saw several firings before being retired to lighter load duties, not at all overstressed and retaining tight pockets. The condition was extremely undesirable nevertheless as the next stage was primer blanking and that considerable size cylindrical plug being blown out into the firing pin hole in the bolt-face and having to be ejected before the next shot was taken.




................ and the powder that produced the cylindrical extrusion/cratering was Alliant Re15. Normally, we don't worry over-much about temperature sensitivity in the British Isles, especially northern Britain where I am. With this 223/90 long-range load with Re15, I had to watch our weather very closely as the occasional summer warm spell would readily produce this primer condition and an occasional blanking episode. Keeping the ammo in an insulated sandwich box helped even if it caused much derision and jokes about infant school lunches. (Even with our cooler weather, I wince seeing 100-ct ammo boxes sitting in full sun with their lids open throughout F-Class matches with no effort made to shade the cartridges. Bear in mind too that we're on the point between 30 and 45 minutes in a GB F match as we pairs shoot, more than long enough exposure to make brass very hot to the touch even in the English sun!)

If it’s hot and sunny first thing I do is put my ammo box in shade and we shoot under a pavilion so maybe I’m lucky but I’ve never had an issue . Only powder in my house !

 

[762plinker]

I’ve been shooting Reloder 15 exclusively for about the last 3 years and haven’t noticed any temp sensitivity. Just sayin !

doing what as in what type of shooting...cause while i shot 15 it has a known history.
now 15.5 is a different story..varget killer

 

[Old Navy]

Define 'blown primers'.

Back in 68 when I first started reloading a little round hole in the primer was called a blown primer. Back around 2001 the guys in my IHMSA circle still used that term. Never head the term blanking until I started hanging out here. Guess I better get my act together and start using the right terms.

 

[762plinker]

Back in 68 when I first started reloading a little round hole in the primer was called a blown primer. Back around 2001 the guys in my IHMSA circle still used that term. Never head the term blanking until I started hanging out here. Guess I better get my act together and start using the right terms.

it comes from the metal forming industry. you can cut metal to shape with a blanking die set.
in the case of the primer the firing pin hole is the die, and the metal is forced in just does not cut loose