[Patch 1.09] Ammo Priming / Weapon Variant Matrix

So there's a lot of confusion going around about this, I finally sat down with the help of /u/Hello_Isaac to just get the info straight from the game files. So far I've been able to corroborate all of this with the weapon variants I do have. Any speculation or anecdotal stories otherwise need to be tested and documented using proper test conditions. "Well it doesn't feel like blah blah blah" is nonsense and will be rightfully ignored.

First, a primer on priming:

www.reddit.com/r/MECoOp/comments/6dhrvx/correlation_between_rof_and_ammo_priming_rate/

To simplify that info, weapons that fired bullets used the formula "RoF/25, min 2 max 10" to determine how many shots it took to prime using ammo (variation comes into play when shooting armored targets). Weapons that fired pellets used "RoF/5, min 10 max 50". There were some oddities in this, with the Venom using bullets instead of pellets and the Dhan using pellets instead of bullets. But otherwise everything worked as expected, up to patch 1.09.

Patch 1.09 introduced 3 variants per weapon: Concussive, Bulwark, and Siphon. The long and short of it is that all 3 variants of every* pistol, shotgun, and sniper rifle use the pellet formula.

*The Dhan flip flops the wrong fucking way, and they still haven't fixed the base weapon. So if you get a Dhan variant, rejoice, you finally have a Dhan that primes the way it ought to.

Chart showing this change visually: docs.google.com/spreadsheets/d/1XXWgkTUsyJ_QwfxD1hv3zL-x9l4TYlABFDzVOhP2wU8/edit?usp=sharing

The Weapon Stats page is included on Sheet 2. It's from 1.08 data so some of the damage numbers are wrong, but I don't believe any of the ROFs changed (we hope).

So, yes, the variants prime. You might not see it because the enemies, especially on Gold and below, might die before you prime them. This does not mean the weapon doesn't prime. 

tl;dr: Concussive, Bulwark, and Siphon variants of Pistols, and Sniper Rifles require ~5 times as many shots as the base weapon to prime with ammo consumables. Shotguns are unchanged (except for the Crusader, Reegar, Venom and Dhan). Assault Rifles are unchanged.