A small igniter in a big motor may not light it.
A big igniter in a small motor may not fit or may be too large to exit the nozzle properly and cause a cato.
I don't know what BATF is. How does one go about acquiring the black powder charges for 2 stage rockets? Do you just need an L1?
Nobody sells just the small BP charges alone that I know of. You have to buy a 1 pound can of BP at a sporting goods store, then make your charges with that.
Ahh so thats what an E-match is! I thought it was used to ignite black powder deployment charges.
All AT reloads hobby line 18-24-29mm come with copperheads a few of the single use come with First fire Jr.
Almost all commercial reloads in 29 and 38mm come with motor starters. when you get to 54mm and up you must supply your own I do believe 54mm CTI com with e-match.
You can get 12 individual premeasured 1.4 gr charges for 6.00 right here. As well as all the motor initiators you want. Pic shows 1 charge, you get 12.....Value Rockets.
If you want an igniter go to a blasting company.
Igniters are technically defined as blasting caps, a device used for electrically setting off tnt, dynamite, or ampho among others. This goes back to the days of fused blasting caps you lit with a match. Sooo ....by the definition used in the blasting industry, an igniter is used to set off an explosion and we should have never called a device to light a rocket motor the same.
This definition explanation comes from talking to a friend of mine who does blasting at a local quarry and also flies rockets. I know there are many other opinions on this and this is why it is better to just to use the PC term.
Enough has been said on this subject. If you want to be PC then order and buy initiators or motor starters.
If you want to be told no, keep asking for igniters. I will make no further comments on this topic.