I changed to cheddite primers last year because of price savings and dont regret it one bit.I use everything the same and they work awsome never had a bad primer from them.Good product at a good price at the place i buy my supplies cheddite-$125 winchester-$169 easy decision.
Call or email the powder company you are using and ask them.
Here is what I do. Take it for what it is worth.
Unless there is published data for them, I use the WW 209 data and have not had any problems. I'd say if you are loading in the low to mid range of the published load for WW209s you are probably safe.
Cheddites are not the same as any other primer. They may be "close" to the Winchester in many loads. Select a load with a low enough pressure (8000 - 8500 PSI) and you should have enough headroom to allow for a significant increase in pressures. Alliant and Hidgdon do have some loads listed for the Cheddite primers. There are actually three different Cheddite shotshell primers listed by the manufacturer. The most common are the CX2000 here. I've seen others over the years. Contact the powder manufacturers for their advice.
Checking them over a chronograph does absolutely nothing to tell you about pressures. You can have an increase in pressures and a drop in velocity.
I, also, have loaded many shells, maybe 100,000 with Cheddites using WW209 data and saw that there MAY be a very slight increase in "average" velocity over the Oehler chronograph with them. That difference, however, was within the velocity of individual shots with WW209s. At that time, I used Winchesters and Cheddites without any changes in loading recipes......breakemall
Glad to see others reloading Cheddites with great success. I've used them as a direct replacement for the Winchester 209's. I've only reloaded about 3500 up to this point. No problems or issues. I love the way they feed in my MEC Presses. I'm not gonna stop buying or using Wins but, I'm gonna continue to use the Cheddites also.
When I first started using Cheddites and there were no recipes around, I contacted them and they said cheddites were very close to Win 209's. I mainly use Green Dot and they recommended using the Win recipe for Green Dot but reduce the powder by .5 grain. It's worked well back to the 27. For years I've heard all the comments about being off sized, etc., but they are not and are very smooth and feed better for me than most others. They are thinner so you never get hard primers, but they will burn through on light 12 loads and 410's. RM
I bought 5000 Cheddite primers because of the price and am down to the last 100. I'll be glad when they are gone!!! I will NOT buy them again. The primers go bang when the trigger is pulled and the loads perform well. However, the lot I bought are 0.002" larger than either Remington or Winchester right under the flange. This has causeds some loading problems which are real headaches. As long as you are loading hulls with real brass heads, such as AA or STS, and don't do any primer substitution, there are no problems. However, just don't go back to an American primer. Every now and then the smaller primer will just fall out; sometimes while you are loading and other times when you take them out of the box. The shells with the American substitutions do seem to work OK in O/U or S/S shotguns, but not in automatics where residual pressure or bolt movement to the rear will often send a spent primer back into the workings of the gun and tie it up. The other problem is that most hulls, especially the Remington Field hulls now use a steel or brass plated steel head. I've had problems with getting Cheddite primers to completly seat when there is no issue with either Remington or Winchester primers. Obviously, the seating can be adjusted, but it always happens right after I've been loading AA or STS hulls with American primers and I forget to make the change. To me the aggravation does not equal the difference in price.
Can you describe what you mean by "burn through" ..
Reason I ask ?
I am using Cheddites in my STS's 12ga 18gr Promo 1 oz and it seems I am not getting the mileage outta the hulls other folks report. I inventory my hulls by number of times fired and am noticing some dark (burn't lookin') crimp petal areas, after 3 times reloaded, with a few splits already. Other folks report loading STS's 6 - 10 times. Just wondering if this is a component problem or just normal for that mileage.