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I have several thousand LRMPs on hand. That could be a lifetime supply if I save them for use in 300 win mag. If I can get by with large rifle primers in the 243, 25-06, 270 and 30-06 with Magpro/H-1000 and faster powders, I will be in good shape. It is looking like that should be doable.
 
I have several thousand LRMPs on hand. That could be a lifetime supply if I save them for use in 300 win mag. If I can get by with large rifle primers in the 243, 25-06, 270 and 30-06 with Magpro/H-1000 and faster powders, I will be in good shape. It is looking like that should be doable.
Except for 300WM, Hornady says you can use standard LRP in all of those.
 
CCI 200's will not always properly light off BL-C(2) in .20-06. Used 250's or a similar magnum primer. However, I've found that CCI 500's will light off BL-C(2) in .223 Rem. with no problems.
 
CCI 200's will not always properly light off BL-C(2) in .20-06. Used 250's or a similar magnum primer. However, I've found that CCI 500's will light off BL-C(2) in .223 Rem. with no problems.
That could be a case fill issue where you have to much airspace inside the case, if so a wade of cotton or more powder(if safe to do) would fix that.
 
Case capacity will play a role as well when using slow burn rate powders. I use slower burning "Magnum" powders (H4831, Re22) in my 257 AI along with LRP's with no issues. That is right in the neighborhood of 50 grains give or take, and with 120 Gr bullets. When you get into loads in the neighborhood of 60 to 70 grains, better use a Magnum primer.
 
30-06AI case, 62-62.5gr of RL22 and I use a non Magnum primer. The Magnum primers don't show a boost in velocity and are not as accurate in this rifle as non Magnum primers.
I've read that approximately 62gr on up is where the Magnum primer may be useful, but my Ruger says "No".
 
Unfortunately I may have already bought some but what powders will not work well with large rifle primers in place of large rifle magnum primers? I have 25-06, 270 Win and 300 Win Mag as the largest capacity cartridges I would be using the magnum powders in.
My large rifle magnum primers will work fine with your 300 Win. Mag. I don't know about your other calibers. The Nosler reloading book has the most complete information on reloading I've ever seen, and I'd advise you to call or email them before I'd take the advice from ANYONE else.
 
I have several thousand LRMPs on hand. That could be a lifetime supply if I save them for use in 300 win mag. If I can get by with large rifle primers in the 243, 25-06, 270 and 30-06 with Magpro/H-1000 and faster powders, I will be in good shape. It is looking like that should be doable.
While you can probably get by with decent performance with standard large rifle primers with H-1000, you might have issues with MagPro, due to it being a fine ball powder that packs very tightly in the case at maximum loads. I believe you would get better results with magnum primers with slow burning ball powders. The extruded (stick) powders are more forgiving when it comes to consistent ignition. Of course, your mileage may vary, but that is what I have seen.
 
That could be a case fill issue where you have to much airspace inside the case, if so a wade of cotton or more powder(if safe to do) would fix that.
BL-C(2) has a fairly narrow range between minimum and maximum charge, there isn't a lot of case capacity tolerance. So a filler might work, but I'm not going to mess around with that on gas gun loads. It's a lot easier for me to switch to a magnum primer, which I have lots of.

H335 and Win748 are medium burn rate ball powders that work well with standard LR primers
In older editions of the Speer reloading manual, they recommended using a magnum primer with 748. Later and current editions don't have this recommendation. Are contemporary primers hotter? Is contemporary 748 somehow improved? I don't know. 748 has long been a favorite of mine in .223 Rem, lower end 55 gr. loads NTE 3,000 fps. It's also been useful (for me, anyway) with 150 gr. loads in .30-06 for the M1 Rifle.

Here a big HOWEVER: Going forward, I'm never going to use a standard primer in a ball powder load in any 30 caliber load. I hate the "click-bang" effect of weak ignition. I have plenty enough LR magnum primers that I don't have to hold back on using them, and because I never load to the max, I'm not concerned about increased pressures.

H335 is another ball powder I've used, exclusively in .223 Rem. I like it; I didn't go out of my way to buy it, I got an 8 pound jug of it in an auction lot. It's a little faster then 748. I've never had issues from using standard primers with either of these powders in .223. I think because the quantity of powder is relatively small compared to the 30's.
 
I found a chart that listed Winchester as just below Magnum primers.


View attachment 1906316



#4 is a Magnum primer and is noted as WLRM (Winchester Large Rifle Magnum)

My preferred primer in the 30-06 Ackley is the Winchester Large Rifle (#6). It works better for me than the CCI 250LRM. More consistent fps and better accuracy. I can substitute between these primers with those loads, though, which isn't a bad thing.
 
My understanding is the only difference is the magnum primers will ignite more consistently in really really cold temperatures, like below freezing. Otherwise they just ignite a little hotter but are otherwise interchangeable if you adjust your powder charge accordingly.
I run LRP in my 280ai with H4350. Friend runs MLRP with H4350 in his 7RM. I just ran my first ladder in my 25-06ai using LRP with H1000 and no signs of pressure.

Use the standard work your way up and dont worry about it.
 
Unfortunately I may have already bought some but what powders will not work well with large rifle primers in place of large rifle magnum primers? I have 25-06, 270 Win and 300 Win Mag as the largest capacity cartridges I would be using the magnum powders in.
25-06 and 270 are just fine with standard (CCI 200) primers. 300 will fire but you may have poor accuracy due to a less consistent burn.
 
I'm going to second Koda's response.
I currently have a load of 71.3gr of h-1000 behind a 100gr ttsx in a .257wby. I'm using a cci200 primer for best results for this particular round in this particular rifle. It's not that I don't have magnum primers, this just happened to be the best combo. I guess my advice would be (if you choose to use them in magnum calibers) find what works best for you on a pleasant day. Then if need be, test your rounds against cooler temps to see how yours reacts.
Fwiw, I don't use much ball powder (coincidentally) so I cannot speak to those issues others have had. I'm gonna log it in the back of my mind though
 

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