Hi,
With the Springfield Echelon Comp and Hellcat Pro ( non comp’d ) is there any specific brand / grain type of ammo i should stay away from because there is known malfunctions with it ?...
Not that I'm aware of. I generally stay with the well-known brands, CCI products (Blazer Brass, Speer Lawman), S&B, PMC, Fiocchi, Remington, Federal, etc. I stay away from WWB simply because I had a bad spell with it a while back, squibs, stovepipes, bad primers/non-fire, etc. I haven't tried it lately. Perhaps Winchester just had a bad QC run a few years back. I dunno. I've also had lots of problems with Armscor .22LR in all of my .22 semi-autos so I also stay away from their other calibers, just for that reason.
I have not looked into whether either of the pistols you mention are rated for +P or +P+ (high pressure) ammo. Take care with high pressure ammo.
There are many brands that I have not tried, YTR, MaxxTech, AAC, etc. I tend to stay away from steel-cased ammo for my pistols. I have used aluminum case with no problems. I've also used Norma and Aguila on occasion.
Be advised that I have not been shooting all that long so my ammo knowledge and experience is not as wide and vast as others on this forum. Maybe read some ammo threads here in the forum, check out reviews on Youtube or gun-related websites. I do research like that before I buy something new. You can always ask here about a particular product.
I shoot mostly 124 grain because that's the SD ammo I use, 124 grain Speer Gold Dot. Many train with 115 grain. The heavier bullets (150 grain, etc) are generally sub-sonic for use with silencers. They shoot a little softer/slower.
Thank you for your indulgence,
BassCliff