began reloading late 70's, just got a 6.5 cm, bought brass, bullets. powder, and primers, then noticed the load data specified small rifle primers.........wondering if i can substitute large rifle for the small primers ?
primer size 6.5 cm
- Thread starter planeoldpoe
- Start date
I think the OP primer pocket is large rifle. He said the "load data" that he has is small rifle primer.
Sandstorm
Gold $$ Contributor
Welcome to the forum planeoldpoe
Id suggest to work your way up to the load like any other..( Start low and work up )
Large Rifle Primer should work for you just fine. What Brass are you using and what powder
are you using to push this bullet of yours.? These guys here are a fantastic source of mostly
useful information. Tell us what your working with and perhaps become a paid member and stick around a while.
Id suggest to work your way up to the load like any other..( Start low and work up )
Large Rifle Primer should work for you just fine. What Brass are you using and what powder
are you using to push this bullet of yours.? These guys here are a fantastic source of mostly
useful information. Tell us what your working with and perhaps become a paid member and stick around a while.
Yeah, the last part of his question threw me.
MikeMcCasland
Team Texas F-T/R
Yes, you can, but I'd start low and work up slowly. Not so much because of the primer, but because there's actually a decent bit of variation in case capacity depending on what brand of brass you're using.
I can tell you starting loads for a piece of Hornady brass will be moderate/warm in Alpha 6.5CM brass for example.
I can tell you starting loads for a piece of Hornady brass will be moderate/warm in Alpha 6.5CM brass for example.
Retired Grunt
F Open Shooter
Two different Primer sizes. Choose the Brass you want to shoot, then buy the correct primer.
The OP is asking if SP brass loading data can be used in his LRP cases if I've read his post right.
AFAIK, the only factory data source that quotes SP brass and primers is Vihtavuori's (as Lapua only made and sold SP 6.5 Creedmoor cases until the middle of this year - it now does both types). Its maximum loads are pretty conservative, so shouldn't produce any problems in most other makes of case, especially as Hornady brass in particular has a noticeably greater internal capacity (which lowers pressures).
There is a difference between usable maximum loads for the two types of case / primer (subject to case capacity remaining the same as in the two forms of the Lapua component). This is for two reasons:
1) Small primers produce significantly less energy than large models, so maximum pressures are also reduced for any given charge. This is partly powder-dependent, so the amount of difference will vary depending on the product used. Some powders need an extra grain weight in the Creedmoor, even 1.5gn in the case of a Europe-only Reload Swiss powder I can think of, to achieve equivalent LP brass MVs in the SP version of Lapua's case.
2) Many shooters opt for an SP variety when there is a choice as here, at least partly because this version provides a stronger case-head / web that will accept higher loads / pressures and/or take a lot more full-pressure loads before the case-head expands to the point where primers become loose in the pockets. As a result, some (many? most?) quoted loads from individuals can be 'hot' - significantly higher pressures than the factory sourced loads will produce.
So, if using (Viht) factory data, there is unlikely to be a problem here - but as always caution must be used with sensible working up charges in modest steps and looking for pressure signs. (Nearly all printed loading manuals state somewhere words to the effect of ..... this data only applies to those particular components quoted ..... but this is less common on website data-sets IME.)
Where loads come from individuals, posts on forums etc, one should be very wary of SP brass loads if there is an intention to use them in LP brass. Many will trash such cases in short order; a few may verge on the dangerous. Caveat emptor as the Romans used to say!
AFAIK, the only factory data source that quotes SP brass and primers is Vihtavuori's (as Lapua only made and sold SP 6.5 Creedmoor cases until the middle of this year - it now does both types). Its maximum loads are pretty conservative, so shouldn't produce any problems in most other makes of case, especially as Hornady brass in particular has a noticeably greater internal capacity (which lowers pressures).
There is a difference between usable maximum loads for the two types of case / primer (subject to case capacity remaining the same as in the two forms of the Lapua component). This is for two reasons:
1) Small primers produce significantly less energy than large models, so maximum pressures are also reduced for any given charge. This is partly powder-dependent, so the amount of difference will vary depending on the product used. Some powders need an extra grain weight in the Creedmoor, even 1.5gn in the case of a Europe-only Reload Swiss powder I can think of, to achieve equivalent LP brass MVs in the SP version of Lapua's case.
2) Many shooters opt for an SP variety when there is a choice as here, at least partly because this version provides a stronger case-head / web that will accept higher loads / pressures and/or take a lot more full-pressure loads before the case-head expands to the point where primers become loose in the pockets. As a result, some (many? most?) quoted loads from individuals can be 'hot' - significantly higher pressures than the factory sourced loads will produce.
So, if using (Viht) factory data, there is unlikely to be a problem here - but as always caution must be used with sensible working up charges in modest steps and looking for pressure signs. (Nearly all printed loading manuals state somewhere words to the effect of ..... this data only applies to those particular components quoted ..... but this is less common on website data-sets IME.)
Where loads come from individuals, posts on forums etc, one should be very wary of SP brass loads if there is an intention to use them in LP brass. Many will trash such cases in short order; a few may verge on the dangerous. Caveat emptor as the Romans used to say!
I got quite the surprise last week shooting my 6.5 CM at 700 yds with two loads differing only in what primer brand was used, not what size primer. Load is 140 SMK over H4350 and Hornaday brass.
After engaging target with load using CCI 200 primers, I shot same load with Fed 210M's and got a big change in POI. Much higher and off to the left by over a foot. As far as consistency goes, the 210M load will shoot in the low .2's but I'm almost out of those primers. Going to have to recheck the CCI 200 load to see if it compares.
After engaging target with load using CCI 200 primers, I shot same load with Fed 210M's and got a big change in POI. Much higher and off to the left by over a foot. As far as consistency goes, the 210M load will shoot in the low .2's but I'm almost out of those primers. Going to have to recheck the CCI 200 load to see if it compares.
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